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Amount.coffee
54 lines (45 loc) · 1.33 KB
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Amount.coffee
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Big = require('../thirdparty/big')
Big.DP = 25
Big.RM = 0
module.exports = class Amount
constructor: (value) ->
if value instanceof Big
@value = value
else if typeof value == 'string'
try
@value = new Big value
catch e
throw new Error('String initializer cannot be parsed to a number')
else
throw new Error('Must intialize from string')
compareTo: (amount) =>
if amount instanceof Amount
return @value.cmp amount.value
else
throw new Error 'Can only compare to Amount objects'
add: (amount) =>
if amount instanceof Amount
return new Amount @value.plus amount.value
else
throw new Error 'Can only add Amount objects'
subtract: (amount) =>
if amount instanceof Amount
return new Amount @value.minus amount.value
else
throw new Error 'Can only subtract Amount objects'
multiply: (amount) =>
if amount instanceof Amount
return new Amount @value.times amount.value
else
throw new Error 'Can only multiply Amount objects'
divide: (amount) =>
if amount instanceof Amount
return new Amount @value.div amount.value
else
throw new Error 'Can only divide Amount objects'
toString: =>
@value.toString()
toJSON: =>
@value.toString()
Amount.ZERO = new Amount '0'
Amount.ONE = new Amount '1'